move seminar finding into before_filter
prevent visiting pages for inactive seminars
add length sanity checks for seminar and date names
whitespace cleanup
:add plain text mailer templates
link to seminar signups on seminars index
fix argument order error
try to fix all signups showing up in admin
attempt 2
add ability to filter signups by date to admin
combine date and content search fields
fix incorrect method call
fix submit button styling issues
select correct date ID after searching
tweak search button style
submit search form after date dropdown changes
fix find_all_signups not taking an argument
make method accessibility match superclass